stop: c000021a fatal system error. Can`t boot from external cd drive.

I have a dell inspiron 1150 with windows XP. System was working fine when all of a sudden I got the black screen followed by the blue screen with this message

stop: c000021a { fatal system error}

I have read the other messages posted on how to solve this problem. But my particular problem is that the CD drive which came with the system doesnt work. I do have an external CD/DVD drive connected to the system. Can some one tell me how to run windows XP setup and reach recovery console using this external drive?